Ala. Const. art. IV, § 111.06

No moneys derived from any fees, excises, or license taxes, levied by the state, relating to registration, operation, or use of vehicles upon the public highways except a vehicle-use tax imposed in lieu of a sales tax, and no moneys derived from any fee, excises, or license taxes, levied by the state, relating to fuels used for propelling such vehicles except pump taxes, shall be expended for other than cost of administering such laws, statutory refunds and adjustments allowed therein, cost of construction, reconstruction, maintenance and repair of public highways and bridges, costs of highway rights-of-way, payment of highway obligations, the cost of traffic regulation, and the expense of enforcing state traffic and motor vehicle laws. The provisions of this amendment shall not apply to any such fees, excises, or license taxes now levied by the state for school purposes for this whole state or for any county or city board of education therein; and the legislature may provide for the manufacture, distribution and use on private passenger or pleasure motor vehicles of personalized license plates or tags, bearing some special letters, figures, mark or badge of distinction or personal prestige in lieu of the regular license plates or tags, and if it does so, the legislature must also require that such tags may be procured only by payment of a fee or charge, in addition to the regular fee, excise or license tax for the registration, operation or use of such motor vehicles upon the highways. The moneys derived from the additional charge made for such special or distinctive license plates or tags, in excess of the cost of the manufacture and distribution of such plates or tags, may be used in such manner as the legislature prescribes.